Abstract
Currently, the preparation of outstanding adsorbents has attracted public concern in environmentally friendly and sustainable pollutant redress. Herein, we report a directional freeze-drying method to prepare a strong and reusable adsorbent by introducing metal-organic framework which modified by ethylene diamine tetraacetic acid (named UiO-66-EDTA) into cellulose nanofiber (CNF) aerogel. Compared to traditional aerogels, the fabricated adsorbent showed a good flexibility and reusability by forming a homogeneous three-dimensional structure. By controlling the concentration of a crosslinkable carboxymethyl cellulose (CMC) solution, we produced aerogels with different pore structures and fibrillar, columnar, and lamellar morphologies. The obtained UiO-66-EDTA/CNF/CMC aerogel (U-EDTACCA) showed an excellent adsorption performance for a total of nine types of heavy metal ions, as the removal efficiency could reach 91%. Moreover, the aerogels could retain 88% of their original shape after five cycles. The aerogel may be an appropriate material for the adsorption of heavy metal ions.
Highlights
Sewage disposal is a global concern subject due to its destructive effect on ecologic sustainability
Poor mechanical properties often impede the practical application of cellulose nanofiber (CNF) aerogels as adsorbents, and pure CNFs tend to re-disperse in water, which results in poor reusability
Presented the removal efficiency of U-EDTACCA for each measured metal ion, and the results showed that the best removal rate of heavy metal ions was 98%
Summary
Sewage disposal is a global concern subject due to its destructive effect on ecologic sustainability. Wastewater, produced during industrial manufacturing for such goods as textiles, cosmetics, and chemical plants, contains many types of toxic dyes, oils, and heavy metal ions [1,2,3,4] To address this issue, various technologies have been researched and developed to dispose of heavy metal ions within an aqueous solution; these include membrane filtration [5], chemical coagulation [2], ion exchange [6], and electrochemistry deposition and adsorption [7,8]. Various technologies have been researched and developed to dispose of heavy metal ions within an aqueous solution; these include membrane filtration [5], chemical coagulation [2], ion exchange [6], and electrochemistry deposition and adsorption [7,8] Among these technologies, the adsorption was the most attracted method due to its several advantages such as simple preparation, cost-effectiveness, and outstanding removal efficiency [9]. The prepared aerogels showed a great potential in practical applications for removing heavy metal ions
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